Mold for head wall construction



Sept. 1, 1953 w. E. MITCHELL MOLD FOR HEAD WALL CONSTRUCTION 5Sheets-Sheet 1 Filed Dec. 5, 1950 William E. Mitchell INVENTOR.

Sept. 1, 1953 w. E. MITCHELL MOLD FOR HEAD WALL CONSTRUCTION I5Sheets-Sheet 2 Filed Dec. 5, 1950 William E. Mitchell INVENTOR.

Sept. 1, 1953 w, E, n'c E 2,650,411

MOLD FOR HEAD WALL CONSTRUCTION Filed Dec. 5, 1950 3 Sheets-Sheet 5Fig.5

William 5 Mitchell INVENTOR.

Patented Sept. 1, 1953 UNITED STATES PATENT OFFICE Claims.

This invention relates to highways and the like, and more particularlyto a mold for use in a head and end wall construction for use in placeswhere a drainage is necessary through fills and cuts or in any otheruneven terrain.

An object of this invention is to provide a mold for building head andend wall constructions which is formed of a plurality of steel platesdetachably secured together which may be used time and again for forminga plurality of different types of head and end walls.

A further object of this invention is to provide a mold of the characterheretofore described that will enable the formation of a head or endwall having smooth sides and chamfered edges so as to resist cracking,crumbling, and other wear and tear.

Still further objects of the invention reside in the provision of a moldfor a head and end wall construction that is strong, durable, capable ofbeing used many times, capable of being readily assembled and easilydetached after the head or end wall has been cast, which is inexpensiveto use, and which will enable the molding of such walls in a minimum oftime by a minimum number of experienced personnel.

These, together with the various ancillary objects of the inventionwhich will become apparent as the following description proceeds, areattained by this head and end wall construction, a preferred embodimentof which has been illustrated in the accompanying drawings, by way ofexample only, wherein:

Figure 1 is a side elevational view of a highway head wall molded in themold comprising the present invention;

Figure 2 is a horizontal sectional view as taken along the plane of line2-2 of Figure 5 but showing in phantom certain parts which are above theplane of the section;

Figure 3 is an elevational view of the rear wall of the mold comprisingthe invention;

Figure 4 is a side elevational view of the invention, parts thereofbeing broken away to show other parts in section and in greater detail;

Figure 5 is a front elevational view of the invention and showing indetail the construction of the supports for the drain pipe; and

Figure 6 is a side elevational View of the invention.

With continuing reference to the accompanying drawings, wherein likereference numerals designate similar parts throughout the various views,reference numeral [0 is used to generally designate a head wall whichhas been molded in the molds provided in the present invention. Thishead wall generally comprises a rear wall [2, a front wall M, afoundation or base member l6 and a pair of side members i8. These wallmembers define an opening 29 therein adapted to retain moisture and todirect such through the drain pipe 22 which is positioned incommunication with the opening 20. The side walls [8 have a concave orarcuate upper surface 24 thereby allowing access of the drain ater toenter the opening 20. Although it will be noted that the rear wall l2has a fiat upper surface 26, it will be noted that the upper surface 28of the front wall [4 is beveled at its outer ends, as at 30. A furtherrefinement will be noted in Figure 1 in that each of the exposed edgesof the head wall has been chamfered or beveled, thereby reducing thetendency of the concrete to crack or crumble under wear and tear.

The mold used in the present invention for forming such a head wall ashereinbefore described, comprises an outer mold portion or frame,generally having a rear wall 32, a front wall 34, and side walls 36 and38. The rear and side walls 32, 3B and 38 are formed of verticallydisposed channel members 40 but depending upon the most preferableconditions, these channel members could likewise be mounted in avertical position. Considering the rear wall 32 of the mold and the sidewalls adjacent thereto, it will be realized and therefore noted thatthese pertions extend above the rest of the mold, as noted in Figures 4and 6, since these portions will comprise that part of the mold formingthe rear wall l2 of the head wall. The channel members 42 and 44 have afurther channel member 46 bolted to their forward flanges, as seen at48. This channel 45 is positioned in such a manner as to allow its lowerflange to substantially rest upon the upper surface of the side walls ofthe outer frame of the mold. Suitably spaced toward the front portion ofthe mold frame is situated another channel member having its lowerflange resting on the side walls 36 and 38 of the outer frame of themold. To insure that the channel member 50 will stand erect in a securemanner, short portions of angle irons, as indicated at 52, are providedfor bolting the lower flange of the channel 50 thereto.

Since the channel members 46 and 50 are rigidly secured to the outermold frame, they provide a rigid support for the inner mold frame,generally indicated at 54.

This inner mold consists generally of front and rear walls 56 and 58,and side Walls 6E! and 62. The height of these walls in the inner moldframe is substantially the same as the height of the front wall M andinclude intermediate channel members 64 joined at the corners with angleirons 86. At the lower edge of each of these channel or angle membersare flange members 68 and it for reinforcement and for securing a baseplate to the entire inner mold frame.

Considering once again the outer mold frame, it will be noted that thefront portion thereof, as seen most clearly in Figures 2, and 6,generally comprises a plurality of upper frame members 34, each havingan outwardly extending peripheral flange l6 thereon. These frame membersl4 constitute an entire panel which is bolted along the outer edges, asat 18, to a portion of the side channel members adjacent thereto. Morespecifically, each of these channel members 80 is constructed in anL-shaped form having a stepped portion 82 at the lower end thereof. Thestepped portion 82 has a vertically disposed angle iron 84 mounted onthe outer surface thereof for supporting a channel member 86 whichfurther extends in a vertical disposition along a portion of the lowerfront side of the outer surface of the outer mold. Similarly positionedon the opposite front portion of the outer mold is a channel member 88extending towards the channel member 86 but defining an opening or spacetherebe tween.

Mounted on the lower flange of the panel of frame member 14 are a pairof similar frame members 90 and 92. Welded to the frames or plates 90and 92 are plates 94 and 96 which are provided with semi-circularrecesses 98 and IM therein which together form a circular aperture I02in which the drain pipe 22 may be positioned so as to abut against theinner mold. It is to be understood that the plates 85 and 88 do notextend fully underneath the plates 94 and 96 since, in this manner, thelatter plates may be slid into place and furthermore, this will permitsome of the concrete from the mold to ooze under the drain pipe 22 andto more accurately and firmly position such throughout a considerableportion of its initial section.

From the foregoing, it will be evident that concrete may be emplaced inthe openings between the inner and outer molds and allowed to settle andharden around the drain pipe 22 and in a form generally that of thespace defined between these two mold frames. However, as seen in thefinished head wall in Figure l, certain other refinements are necessaryin the mold frame to effect the desired result. These features consistgenerally of members to provide chamfered surfaces or edges, as seen atM in Figure 1, and further, some means to limit the upward surface ofthe front and rear walls [4 and i2, respectively.

Accordingly, as seen in Figures 25, the chamfering means employedconsist of angle or wedge shaped members I06 generally extendingthroughout all of the corners wherein the desired chamfering effect isneeded. More specifically, in Figure 2, suitable lengths of wedgemembers I07 are provided in each of the vertical corners of the outermold frame. Along the front and rear walls and disposed along the upperportions thereof, are horizontal wedge shaped members 106. Similar wedgeshaped members 108 are provided along the outer surface of the innermold, also disposed along the upper portions of that frame. However,along the inner upper edges of the sides of the outer mold frame aslightly different condition as regards the wedge members MM isconcerned. Accordingly, a wedge member, as Ill, extends along the innersurface of the channel 44 and at the end thereof extends in an arcuateform along that portion of the side wherein the concrete will mold toform the recess 24. At the end of the arcuate bend, the wedge member I Il extends frontwardly to the front side 34.

It is to be noted that as an important feature of the invention the sidewalls 60 and 62 are provided with an arcuate concave angle or wedgeshaped member H0. These members H!) are provided in order to permit theformation of the recess 24 in the head wall after such has been cast.This arcuate wedge member H0 further provides a chamfered surface alongthis inner edge and is to be used as a guide when troweling or levelingout the surface 24. However, it is to be understood that the concrete,as poured, is of such consistency and high viscosity that it may bereadily shaped during the molding toconform with the shape of the wedgemember I 10.

To provide for a different height in either the front or rear wall,U-shaped brackets H2 and I 14 are provided along the upper portions ofthe entire mold between the rear sides 32 and 58 and the front sides 34and 56, respectively. Further, each of these U-shaped members has avertical slot in either leg thereof, whereby these members may beadjusted vertically by means of bolts placed within the slots. In orderthat the chamfered edges may be vertically adjusted according to theheight of the surfaces 26 and 28, the wedge members I06 have been weldedor in some other manner secured to the lower surfaces of the U-shapedmembers H2.

In order to properly space the inner mold be tween the side walls of theouter mold, there are provided spacers H6 which extend between the innerand outer molds. Suitable bolts H8 extend through these tubular spacersH6 in order to tie the inner and outer molds together, When the headwall has been cast, it is merely necessary to loosen the bolts and, boththe bolts and spacers may be removed above the level of the recessedsurface 24.

From the foregoing, it is believed that it will be evident that a moldfor forming head or end wall constructions has been provided. This moldconsists generally of inner and outer frames, the space definedtherebetween being a configuration of the desired construction of heador end wall. Certain refinements have been provided allowing for theadjustability in the level of the front and rear surfaces of the headwall and further, adjustability of the chamfered surfaces to be providedon the edges of the head Wall construction. Finally, arcuate members areprovided on the outer surfaces of the sides of the inner mold for thepurpose of both chamfering the inner edges of the head wall and forguiding the movement of the trowel or smoothing instrument.

It should be further readily apparent that since the construction ofboth the inner and outer molds have been formed of a plurality ofchannel members, the size of the mold may be readily adjusted by addingor subtracting median sections to either of the frames thereby providinga head wall which will correspond with highway requirements of thevarious states to allow varying thicknesses of concrete walls.

Since, from the foregoing, the construction and advantages of this headand end wall con- 'struction are readily apparent, a further descriptionis believed to be unnecessary.

However, since numerous modifications will readily occur to thoseskilled in the art after a consideration of the foregoing specificationand accompanying drawings, it isnot intended to limit the invention tothe precise embodiment shown and described, but all suitablemodifications and equivalents may be resorted to which fall within thescope of the appended claims.

Having described the invention, What is claimed as new is:

1. A mold for head and end wall construction comprising a rectangularouter mold having a front and back wall and side walls, said side andback walls being constructed of vertically arranged channel members; theweb portions of said channels forming the inner surface of said Walls,the flanges of said. channel members being detachably secured togetherto provide a wall panel, angle members detachably secured to the channelflanges at the corners for rigidly connecting said side and back walls,said back wall and the side channel members adjacent the back wall beingof greater height than the remaining channel members of the side wall, atransverse channel member having one flange resting on the side walls,the web side of said transverse channel member being detachablyconnected to the flanges of said side channel members of greaterheights, said front wall including a plurality of panels, angle memberssecured at the edge of said panels, fastening means securing said-panelstogether and to said side walls, an inner mold, having wallssubstantially parallel to said outer mold walls, sad walls of said innermold being composed of vertically extending channel members, the flangesof said channels extending inwardly and being secured together toprovide wall panels, corner angles secured to said wall panels andrigidly joining said panels together.

2. A mold for head and end wall construction comprising a rectangularouter mold having a front and back wall and side walls, said side andback walls being constructed of vertically arranged channel members, theWeb portions of said channels forming the inner surface of said walls,the flanges of said channel members being detachably secured together toprovide a wall panel, angle members detachably secured to the channelflanges at the corners for rigidly connecting said side and back walls,said back wall and the side channel members adjacent the back wall beingof greater height than the remaining channel members of the side wall, atransverse channel member having one flange resting on the side walls,the web side of said transverse channel member being detachablyconnected to the flanges of said side channel members of greaterheights, said front wall including a plurality of panels, angle memberssecured at the edge of said panels, fastening means securing said panelstogether and to said side walls, an inner mold, having wallssubstantially parallel to said outer mold walls, said Walls of saidinner mold being composed of vertically extending channel members, theflanges of said channels extending inwardly and being secured togetherto provide wall panels, corner angles secured to said wall panels andrigidly joining said panels together, the rear wall of said inner moldbeing rigidly secured in parallel relation to said transverse channel toform the front mold of the rear portion of the head wall, said rear wallof said inner mold and said transverse channel forming a continuous moldsurface, a second transverse channel member extending across the sidewalls and detachably secured thereto, the front wall of said inner moldbeing secured to said second transverse channel;

3. A mold for headand end wall construction comprising a rectangularouter mold having a front and back wall and side Walls, said side andback walls being constructed of vertically arranged channel members, theweb portions of said channels forming the inner surface of said walls,the flanges of said channel members being detachably secured together toprovide a wall panel, angle members detachably secured to the channelflanges at the corners for rigidly connecting said side and back walls,said back wall and the side channel members adjacent the back wall beingof greaterheight than the remaining channel members of the side wall, atransverse channel member having one flange resting on the side walls,the web side of said transverse channel member being detachablyconnected to said side channel member of greater heights, said frontwall including a plurality of panels, angle members secured at the edgeof said panels, f ase tening means securing said panels together and tosaid side walls, an inner mold, having walls substantially parallel tosaid outer mold walls, said walls of said inner mold being composed ofvertically extending channel members, the flanges of said channelsextending inwardly and being secured together to provide wall panels,corner angles secured to said Wall panels and rigidly joining saidpanels together, the rear wall of said inner mold being rigidly securedin parallel relation to said transverse channel ,to form the front moldof the rear portion of the head wall, a second transverse channel memberextending across the side walls and detachably secured thereto, thefront wall of said inner mold being secured to said second transversechannel, an arcuate concave guide surface placed between the side wallsof the inner and outer molds, spacer members positioned between sidewalls of said inner and outer molds above said arcuate guide surfaces,and means extending through said spacer members detachably securing saidinner and outer molds together.

4. A mold for head and end wall construction comprising a rectangularouter mold having a front and back Wall and side walls, said side andback Walls being constructed of vertically arranged channel members, theweb portions of said channels forming the inner surface of said walls,the flanges of said channel members being detachably secured together toprovide a Wall panel, angle members detachably secured to the channelflanges at the corners for rigidly connecting said side and back walls,said back Wall and the side channel members adjacent the back wall beingof greater height than the remaining channel members of the side wall, atransverse channel member having one flange resting on the side walls,the web side of said transverse channel member being detachably 7extending inwardly and being secured together to provide wall panels,corner angles secured to said wall panels and rigidly joinin said panelstogether, the rear Wall of said inner mold being rigidly secured inparallel relation to said transverse channel to form the front mold ofthe rear portion of the head wall, a second transverse channel memberextending across the side walls and detachably secured thereto, thefront Wall of said inner mold being secured to said second transversechannel, an arcuate concave guide surface placed between the side wallsof the inner and outer molds, spacer members positioned between sidewalls of said inner and outer molds above said arcuate guide surfaces,and means extending through said spaced members, detachably securingsaid inner and outer molds together, said guide surfaces being wedgeshaped in cross section and adjustably secured to the surface of saidinner and outer molds.

5. A mold for head and end Wall construction comprising a rectangularouter mold having a front and back wall and side walls, said side andback walls being constructed of vertically arranged channel members, theweb portions of said channels forming the inner surface of said walls,the flanges of said channel members being detachably secured together toprovide a wall panel, angle members detachably secured to the channelflanges at the corners for rigidly connecting said side and back walls,said back wall and the side channel members adjacent the back wall beingof greater height than the remaining channel members of the side wall, atransverse channel member having one flange resting on the side Walls,the web side of said transverse channel member being detachably 5connected to said side channel members of greater heights, said frontWall including a plurality of panels, angle members secured at the edgeof said panels, fastening means securing said panels together and tosaid side walls, an inner mold, having walls substantially parallel tosaid outer mold walls, said walls of said inner mold being composed ofvertically extending channel members, the flanges of said channelsextending inwardly and being secured together to provide Wall panels,corner angles secured to said wall panels and rigidly joining saidpanels together, the rear wall of said inner mold being rigidly securedin parallel relation to said transverse channel to form the front moldof the rear portion of the head wall, a second transverse channel memberextending across the side walls and detachably secured thereto, thefront wall of said inner mold being secured to said second transversechannel, wedge shaped chamber forming elements adjustably positionedaround the inner and outer mold surfaces, said elements formingtroweling guides for the top surface of the molded material.

WILLIAM E. MITCHELL.

References Cited in the file of this patent UNITED STATES PATENTS MathisMar. 15, 1949

